omeganum 1.0.3

Stores numbers up to 10{N}9e15.
Documentation 
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#[cfg(not(feature = "std"))]
extern crate alloc;
#[cfg(any(feature = "std", docsrs))]
extern crate std;

#[cfg(not(feature = "std"))]
pub use alloc::{borrow::Cow, vec::Vec};
#[cfg(any(docsrs, feature = "std"))]
pub use std::{borrow::Cow, error::Error, vec::Vec};

#[cfg(all(not(feature = "std"), feature = "error_in_core"))]
pub use core::error::Error;

pub trait VecExt<T> {
    fn first_mut_or_push(&mut self, value: T) -> &mut T;
}

impl<T> VecExt<T> for Vec<T> {
    fn first_mut_or_push(&mut self, value: T) -> &mut T {
        if self.is_empty() {
            self.push(value);
        }
        self.first_mut().expect("there must be at least one element here due to the push above")
    }
}